Sash-lock.



w. 1). RANKIYNS.

SASH LOCK,

APPLIGATION IILED JUNE 27, 1904.

Patented Oct. 20, 1908,

Inventor.

I Witnesses WILLIAM DWIGHT RANKINS, OF MODESTO, CALIFORNIA.

SASH-LOGK.

Specification of Letters Patent.

Patented Oct. 20, 1908.

Application filed June 27, 1904. Serial No. 214,361.

To all whom it may concern:

Be it known that 1, WILLIAM D. RANKINs, a citizen of the United States,residing at Modesto, in the county of Stanislaus and State ofCalifornia, have invented a new and useful Sash-Lock, of which thefollowing is a specification.

My invention relates to sash locks and has for its objects to produce acomparatively simple, inexpensive device of this character which may bereadily manipulated to permit raising or lowering the sash or forsecurely locking the latter against movement, and one in which thedevice will, when in locked position, effectually prevent rattling ofthe sash within its casing.

To these ends the invention comprises the novel features of constructionand combination of parts more fully hereinafter described.

In the accompanying drawings, Figure 1 is a perspective view of aportion of a win-- dow and its casing showing my invention tional viewcentrally and longitudinally applied thereto. Fig. 2 is a horizontalsecthrough the sash lock. Fig. 8 is a perspective view of the lockremoved from the sash.

Referring to the drawings, 1 designates a window, 2 its sash, 3 the sashframe or casing, and 1 a vertical longitudinal rack or its equivalentapplied to the latter adjacent to the outer face of the sash. Thewindow, the sash and the casing, may be of the usual or of any preferredconstruction, but the rack 1 preferably consists simply of a strip ofmetal, corrugated to present a series of undulations, each of which maybe regarded constituting a tooth of said rack.

Attached by means of screws or other suitable fastening devices 5 to thesash 2, is the casing 6 of my improved lock, this casing, which iscomposed of metal, being preferably of tubular form as shown andprovided with a pair of oppositely extended perforated ears 7 for thereception of the fastening devices.

Arranged for longitudinal reciprocation within the shell or case 6, is alocking member or bolt 8 which normally projects through the forwardopen end of the case for engagement with the rack 4 and is pressed toengaging position by means of an expanded sprlng 9 bearing at its endsrespectively against the rear end of the bolt and the rear closed end ofthe case.

Detachably engaged with and carried by the bolt 8 is a transverseprojecting actuating and locking member or arm 10 adapted to travel in atransversely inclined cam slot or way 11 provided through the wall ofthe casing 6, said slot being provided at the normally lower end of itsfront marginal wall with a slight depression or seat 12 and oppositesaid seat with a rearward extension or branch 13 disposed longitudinallyof the casing.

In practice the spring 9 will normally press the locking bolt forwardinto engagement with the corrugated strip constituting the rack 4 withsufficient force to hold the window in any desired position againstaccidental movement and under such conditions the arm 10 will lie withinthe seat or depression 12 to prevent accidental movement of the member.WVhe'n, however, it is de sired to securely lock the window againstmovement the arm 10 is turned from its normal position, as seen in Fig.1 to the locking position shown in Fig. 3 and will, in traveling throughthe cam slot 11, be actuated by the latter for pressing the forward endof the locking bolt into firm and secure engagement with the corrugatedstrip or rack 4. It is to be noted that under these conditions the sashwill be forced in an opposite direction from the bolt and will thus beprevented from looseness or rattling within its casing. IV hen it isdesired to release the sash for free movement within its frame, themember 10 is brought opposite the forward end of and pressed rearwardinto the longitudinal extension 13 of the slot, thereby retracting thebolt against the action of spring 9 to fully release the forward end ofthe latter from engagement with the rack, 4. The rack 4:, which, asalready described, is preferably constructed or composed of acorrugated, undulating strip of metal, as clearly shown in Fig. 1 of thedrawings, may be produced at a very trifling expense as compared withdevices of this class ordinarily employed; it will also be observed thatthe projecting, engaging point of the bolt 8 is rounded'so that, whenthe handle member 10 of the said bolt is not in engagement with the camgroove 11, the engagingpoint of the bolt Will be capable of slidingfreely over the teeth 'or undulations of the corrugated strip or rack,and at the same time be held operatively in engagement therewith by thebe raised or lowered without necessity for operating the fastenlngdevice, the bolt of which will slip or slide over the corrugated orundulating strip constituting the rack, in such a manner, however, as toengage the latter, under the tension of the actuating spring, withsufficient tenacity to support the sash in any position to which it maybe adjusted. The construction of the bolt and its casing is extremelysimple and effective, the former being throughout its length of anexterior diameter equal to the interior diam- 5 eter of the casing,which latter is closed at ing from the spirit of the invention.

Inasmuch as the distance between the rear side of the arm 10 and the tipof the rounded end of the bolt 8 is greater than the distance betweenthe rear edge of the spiral portion 11 of the slot in the vicinity ofthe closed end thereof and the surfaces of the valleys of the keeper 4when the said arm 10 is forced into the spiral portion 11 of the slotthe rear edge of the said portion will move the bolt 8 longitudinallyand force the pointed end thereof into engagement with the valleys ofthe keeper 4. Thus a positive lock is provided.

Inasmuch as the distance between the forward side of the bolt arm 10 andthe tip of the rounded end of the bolt 8 is less than the distancebetween the bottom of the seat 12 and the surface of the valleys of thekeeper 4:; and is greater than the distance between 7 the bottom of theseat 12 and the surfaces of the ridges of the keeper 1; when the saidarm 10 is lodged in the seat 12 theend of the bolt 8 will have resilientcontact with the ridges of the keeper t, thus the window may be moved upor down without manipulating the bolt and the window will be retained atany desired position but is not positively locked in such position asabove described.

Inasmuch as the distance from the closed rear end of the longitudinalportion 13 of the slot to the open end of the casing 6 is greater thanthe distance from the bolt arm 10 to the tip of the rounded end of thebolt 8; when the said arm 10 is manually moved back into the portion 13of the slot the bolt S is entirely out of engagement with the keeper 4.

Having thus described the invention, what is claimed is In a device ofthe kind described, a keeper,

a lock comprising a casing provided with a cylindrical recess thereinadapted to receive a bolt, and a cam groove extending therethrough andfurther provided with a T-slot at one end of said cam groove arrangedparallel with the axis of said cylindrical recess, a bolt held in saidcylindrical recess, a spring in said recess arranged to normally presssaid bolt outward, a handle attached to said bolt projecting outwardfrom the casing arranged to lie in said slots, said handle beingarranged to force said bolt into positive engagement with said keeper bymeans of saidcam slot, to permit spring pressed frictional engagement ofsaid bolt with said keeper when lying in one end of said T-slot, and topermit the freeing of said bolt from said keeper when drawn into theopposite end of said T-slot.

In testimony that I claim the foregoing as my own, I have hereto affixedmy signature in the presence of two witnesses.

WILLIAM DWIGHT RANKINS.

Vitnesses C. O. ANDERSON, J. D. HARP. r

